CN118151103A - Method, application method, system and storage medium for generating emission waveform group - Google Patents
Method, application method, system and storage medium for generating emission waveform group Download PDFInfo
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Abstract
The application provides a method, an application method, a system and a storage medium for generating a transmitting waveform group; the method for generating the emission waveform group comprises the following steps: firstly, determining waveform parameters of the frequency modulation wave according to the performance index of the current radar, wherein the waveform parameters at least comprise a first preset waveform parameter and a second preset waveform parameter; then constructing a waveform parameter set corresponding to the first preset waveform parameter based on the performance index; and finally, obtaining the frequency modulation wave according to the waveform parameter set and the second preset waveform parameter so as to generate a transmitting waveform group according to the frequency modulation wave. The emission waveform group generated by the application is not only suitable for single-shot single-received millimeter wave radar, but also suitable for multi-shot multi-received millimeter wave radar, and can be also suitable for time division multiple access modulation radar and Doppler multiple access modulation radar; the generation method can improve the anti-interference capability of the radar while meeting the detection performance of the radar, has simple waveform, is easy to realize engineering, and can be well adapted to the existing signal processing method.
Description
Technical Field
The present application relates to the field of radar technologies, and in particular, to a method, an application method, a system, and a storage medium for generating a transmit waveform set.
Background
The radar sensor has long detection distance and all-weather working characteristics all day long, and is widely applied to the fields of military use, civil use and the like. In particular, in civil fields, such as intelligent driving and traffic application scenes, millimeter wave radars are rapidly popularized and applied as one of sensors for acquiring surrounding environment information, and the importance of the millimeter wave radars is accepted by markets. In vehicle-mounted applications, traffic applications and the like, millimeter wave radars generally adopt a frequency modulation continuous wave system, and the modulation form is relatively simple. However, with the increasing of automotive radar products in road traffic, the probability and risk of mutual interference between radars are increased, and radar detection performance may be reduced, for example, false targets are increased, and the problem of weak target omission is caused, so that erroneous judgment and other operations are caused.
In order to further improve the anti-interference detection performance of the radar, expert scholars and engineers propose various waveform design methods, and the current research is widely conducted on frequency agile radars, phase coded radars and the like, so that the radars are often applied to long-distance detection and cannot be adapted to the existing vehicle-mounted millimeter wave radar system. Researchers have also proposed improving the anti-interference capability of waveforms by inter-pulse carrier frequency modulation of frequency modulated continuous waves, but the waveform design method can cause the inability of coherent accumulation in the slow-time dimension of echoes, and the waveform design method needs to perform corresponding phase compensation on echo data to perform conventional signal processing such as two-dimensional Fourier transform, which increases the complexity of signal processing.
Disclosure of Invention
The application provides a method, an application method, a system and a storage medium for generating a transmitting waveform group, which are used for solving the technical problems that a frequency agile radar and a phase encoding radar in the prior art cannot be adapted to the existing vehicle millimeter wave radar system, and solving the technical problems that echo slow time dimension cannot be coherently accumulated and conventional signal processing can be performed only by carrying out phase compensation on echo data caused by carrying out inter-pulse carrier frequency modulation on a frequency modulated continuous wave in the prior art.
Specifically, the application provides a method for generating a transmitting waveform group, which comprises the following steps:
S100: and determining waveform parameters of the frequency-modulated wave according to the performance index of the current radar, wherein the waveform parameters at least comprise a first preset waveform parameter and a second preset waveform parameter.
S200: and constructing a waveform parameter set corresponding to the first preset waveform parameter based on the performance index.
S300: and acquiring a frequency modulation wave according to the waveform parameter set and a second preset waveform parameter so as to generate a transmitting waveform group according to the frequency modulation wave.
In the above technical solution, the transmitting waveform group is not only suitable for single-shot single-received millimeter wave radar, but also suitable for multi-shot multi-received millimeter wave radar, and simultaneously suitable for time division multiple access modulation radar and Doppler multiple access modulation radar; according to the performance index of the current radar, the waveform parameters of the frequency modulation waves can be flexibly determined, and different radar requirements and application scenes can be adapted by adjusting the first preset waveform parameters and the second preset waveform parameters; the generation of the emission waveform group is based on the characteristics and parameter settings of the frequency modulation waves, and the performance index of the radar can be optimized through reasonable frequency modulation wave generation, so that the target detection and tracking effects are improved; the generation method can improve the anti-interference capability of the radar while meeting the detection performance of the radar, has simple waveform, is easy to realize engineering, and can be well adapted to the existing signal processing method.
Further, the first preset waveform parameters at least comprise a center frequency parameter, a transmitting period parameter and a frequency modulation slope parameter; the second preset waveform parameters at least comprise a transmission effective time parameter and a signal bandwidth parameter; the waveform parameter set at least comprises a center frequency set, a transmission period set and a frequency modulation slope set.
In the technical scheme, the parameters are aimed at the core indexes of radar signal processing, and the specific requirements and application scenes of the radar can be met through a transmitting waveform group obtained through reasonable design.
Further, the step S200 includes:
acquiring a working frequency band of a current radar, and acquiring a first preset center frequency point according to the working frequency band and performance indexes to construct a center frequency set according to the first preset center frequency point; the interval between any two center frequency points is larger than the preset signal bandwidth.
In the technical scheme, the construction of the center frequency set is based on the working frequency band and the performance index, so that the method can flexibly adapt to different radar use environments and requirements, and the requirements of different working frequency bands and signal bandwidths can be met by reasonably setting the number of the center frequency points; the interval between any two center frequency points in the center frequency set is larger than the preset signal bandwidth, so that the frequencies of all waveforms can be ensured not to interfere with each other, the mutual interference between signals is avoided, and the independence and the reliability between the waveforms are ensured; through reasonable selection of the center frequency point, the working frequency band of the current radar can be fully utilized, the frequency coverage range between waveforms is ensured to be reasonable, radar transmitting resources are utilized to the greatest extent, and the efficiency of a transmitting waveform group is improved.
Further, the step S200 further includes:
acquiring a second preset emission period according to the performance index to construct an emission period set according to the second preset emission period; wherein, each emission period is larger than the preset effective emission time.
In the technical scheme, the second preset transmitting period is acquired according to the performance index, so that the requirement of the radar on the transmitting period can be accurately met; each emission period in the emission period set is larger than the preset effective emission time, so that the enough time length of the emission signal is ensured, the problems of signal interception and incompleteness are avoided, the integrity of the emission signal can be ensured, and the reliability and the effectiveness of the radar system are improved.
Further, the step S200 further includes:
And obtaining a frequency modulation slope positive value and a frequency modulation slope negative value according to the performance index, and constructing a frequency modulation slope set according to the frequency modulation slope positive value and the frequency modulation slope negative value.
In the technical scheme, the positive value and the negative value of the frequency modulation slope are obtained according to the performance index, so that the requirement of the radar on the frequency modulation slope can be accurately met, and the range of the frequency modulation slope and the selection with proper precision and accuracy can be ensured by constructing the frequency modulation slope set; by constructing the frequency modulation slope set, frequency modulation waves with different slopes can be generated, different frequency modulation waves have different frequency change speeds, and frequency change with a larger range and higher speed can be realized, so that different radar detection requirements are met.
Further, the step S300 includes:
and acquiring a target central frequency, a target transmitting period and a target frequency modulation slope corresponding to a third preset frequency modulation wave from the central frequency set, the transmitting period set and the frequency modulation slope set, and generating the third preset frequency modulation wave by combining preset transmitting effective time and preset signal bandwidth so as to generate a transmitting waveform group according to the third preset frequency modulation wave.
In the technical scheme, the parameters of the frequency modulation wave can be accurately determined by acquiring the target center frequency, the transmitting period and the frequency modulation slope from the center frequency set, the transmitting period set and the frequency modulation slope set, so that the transmitting waveform set can be ensured to meet the preset requirement, and the accuracy of the radar system is improved; when the target frequency modulation wave is generated by combining the preset transmission effective time and the preset signal bandwidth, the frequency range and the change rate of the waveform can be optimized, so that the target frequency modulation wave can be ensured to complete frequency change within the specified effective time, the waveform is prevented from exceeding the range of the preset signal bandwidth, and the detection and resolution capability of the radar system to the target is further improved.
Based on the same conception, the application also provides an application method of the emission waveform group, which is applied to the emission waveform group generation method, and the application method comprises the following steps:
a transmit waveform group is acquired in response to the transmit waveform group generation signal.
Radiating the emission waveform group to a preset area to obtain a received signal of the emission waveform group after being reflected by a preset target in the preset area, and performing first preset processing on the received signal to generate a digital signal.
And carrying out second preset processing on the digital signal to obtain the trace information of the preset target.
In the technical scheme, after the emission waveform group is radiated to the preset area, the received reflected signal is subjected to preset processing to generate a digital signal, and the obtained digital signal can reflect the characteristics and information of a preset target more accurately because the emission waveform group has optimized parameters and characteristics; by carrying out second preset processing on the digital signals, the trace information of the preset target can be extracted, so that subsequent data analysis and processing can be conveniently carried out, the target is identified, valuable information is extracted, and a foundation is provided for further target tracking and analysis.
Further, the first preset processing at least comprises local oscillation mixing processing, filtering processing and sampling processing.
In the technical scheme, the received signal can be converted into the baseband frequency through the local oscillation mixing processing, so that the subsequent signal processing and analysis are convenient, the signal frequency can be reduced, the processing complexity is reduced, and the working efficiency of the system is improved; the filtering process can remove unnecessary frequency components and noise, and keep the effective part of the target signal, so that the signal-to-noise ratio can be improved, interference and erroneous judgment are reduced, and the reliability and accuracy of the target signal are improved; the sampling process converts continuous analog signals into discrete digital signals, the signal resolution and the calculation complexity can be balanced by reasonably selecting the sampling rate and the sampling point number, and the sampling process can retain important information of the signals, so that the subsequent digital signal processing and feature extraction are facilitated.
The second preset process at least comprises Fourier transformation, target detection, angle measurement and speed ambiguity resolution.
In the technical scheme, the Fourier transform can convert the signals in the time domain into the frequency domain for spectrum analysis, the frequency domain characteristics of the signals can be extracted through the Fourier transform, and the frequency spectrum analysis is carried out on the target signals, so that the frequency characteristics of the target can be rapidly identified and extracted; the target detection is to identify and detect the target signal based on a signal processing method, and through the signal after the preset processing, various target detection algorithms can be used for automatically identifying and detecting the target, so that the automation degree and the detection precision of the system are improved; the angle measurement is to measure the azimuth or angle of the target by using the received signal, and the azimuth or angle information of the target can be determined by carrying out angle measurement on the signal after the preset treatment, so that the positioning and the orientation of the target are realized; the speed blurring is frequency blurring caused by the movement of the target, and the speed information of the target can be accurately inverted through speed blurring solving processing, so that the measuring precision of the speed of the target is improved.
Based on the same conception, the application also provides a system for applying the method for transmitting the waveform group, which comprises:
The acquisition module is used for: for acquiring a transmit waveform group in response to the transmit waveform group generation signal.
And a radiation module: for radiating the set of transmit waveforms to a predetermined area.
And a receiving module: and the receiving signals are used for acquiring the receiving signals of the transmitting waveform group after being reflected by the preset target in the preset area.
A first processing module: and the digital signal processing unit is used for carrying out first preset processing on the received signal to generate a digital signal.
And a second processing module: and the digital signal processing unit is used for carrying out second preset processing on the digital signal so as to acquire the trace information of the preset target.
In the technical scheme, after being radiated to a preset area and subjected to preset treatment, the generated digital signal can accurately reflect the characteristics and information of a preset target due to the optimized parameters and characteristics of the emission waveform group; and the digital signals are subjected to second preset processing, so that the trace information of the preset target can be extracted, a basis is provided for subsequent data analysis and processing, the target can be conveniently identified, valuable information can be extracted, and further tracking and further analysis work of the target are supported.
Based on the same idea, the present application also provides a storage medium having stored therein a computer program, wherein the computer program is arranged to execute the application method of the transmit waveform group at run-time.
Compared with the prior art, the application has the beneficial effects that:
The method comprises the steps of firstly determining waveform parameters of the frequency-modulated wave according to the performance index of the current radar, wherein the waveform parameters at least comprise a first preset waveform parameter and a second preset waveform parameter; then constructing a waveform parameter set corresponding to a first preset waveform parameter based on the performance index; and finally, obtaining a frequency modulation wave according to the waveform parameter set and a second preset waveform parameter so as to generate a transmitting waveform group according to the frequency modulation wave. The emission waveform group generated by the method is not only suitable for single-shot single-received millimeter wave radar, but also suitable for multi-shot multi-received millimeter wave radar, and can be also suitable for time division multiple access modulation radar and Doppler multiple access modulation radar; the generation method can improve the anti-interference capability of the radar while meeting the detection performance of the radar, has simple waveform, is easy to realize engineering, and can be well adapted to the existing signal processing method.
Drawings
Fig. 1 is a flowchart of a method for generating a transmit waveform group according to the present application.
Figure 2 is an echo range-doppler spectrum under a conventional transmit waveform set.
Wherein figures 2-a, 2-b, 2-c and 2-d are range-doppler spectra of a first frame, a second frame, a third frame and a fourth frame, respectively, of a conventional transmit waveform set.
Fig. 3 is a schematic diagram of a transmit waveform set generated according to an embodiment of the present application.
Figure 4 is an echo range-doppler spectrum for a set of transmit waveforms generated by the present application.
Wherein, fig. 4-a, fig. 4-b, fig. 4-c and fig. 4-d are respectively the range-doppler spectra of the first frame, the second frame, the third frame and the fourth frame of the transmission waveform group generated by the present application.
Fig. 5 is a flowchart of an application method applied to the transmit waveform group shown in fig. 1.
Fig. 6 is a system frame diagram of an application method of the transmit waveform group shown in fig. 5.
Detailed Description
The application provides a method, an application method, a system and a storage medium for generating a transmitting waveform group, which are used for solving the technical problem that a frequency agile radar and a phase encoding radar in the prior art cannot be adapted to the existing vehicle-mounted millimeter wave radar system; the method also aims to solve the technical problems that in the prior art, the slow-time dimension of the echo cannot be coherently accumulated due to inter-pulse carrier frequency modulation of the frequency modulation continuous wave, and conventional signal processing can be performed only by performing phase compensation on echo data.
The following describes a method, an application method, a system and a storage medium for generating a transmission waveform group according to the present application in further detail with reference to specific embodiments and drawings.
Embodiment one:
referring to fig. 1, the present application provides a method for generating a transmit waveform group, which includes the following steps:
S100: and determining waveform parameters of the frequency-modulated wave according to the performance index of the current radar, wherein the waveform parameters at least comprise a first preset waveform parameter and a second preset waveform parameter.
In this embodiment, the performance index may include a maximum detection distance, radar resolution, target detection probability, measurement accuracy, anti-interference performance, speed, and the like; there may be different performance requirements depending on different radar types, but is not limited thereto.
Further, the frequency modulation wave is a Chirp wave, which is a waveform signal with gradually changing frequency.
Further, the first preset waveform parameters at least comprise a center frequency parameter, a transmitting period parameter and a frequency modulation slope parameter; the second preset waveform parameters at least comprise a transmission effective time parameter and a signal bandwidth parameter.
In the present embodiment, the transmission period parameter and the transmission effective time parameter are referred to as a chirp period parameter and a chirp effective time parameter.
In the technical scheme, the parameters are aimed at the core indexes of radar signal processing, and the specific requirements and application scenes of the radar can be met through a transmitting waveform group obtained through reasonable design.
S200: and constructing a waveform parameter set corresponding to the first preset waveform parameter based on the performance index.
Further, the waveform parameter set at least includes a center frequency set, a transmission period set, and a frequency modulation slope set.
It should be noted that the waveform parameter set is also determined according to the performance index of the current radar, but is not limited thereto.
Further, the step S200 includes:
acquiring a working frequency band of a current radar, and acquiring a first preset center frequency point according to the working frequency band and performance indexes to construct a center frequency set according to the first preset center frequency point; the interval between any two center frequency points is larger than the preset signal bandwidth.
In this embodiment, P center frequency points are selected in the radar operating frequency band, and a center frequency set f= { F 1、f2、…、f P }, where P >1, is constructed.
The working frequency band of the current radar is assumed to be 76GHz to 81GHz, and according to the preset signal bandwidth and the central frequency, the two parameters are assumed to be 200MHz and 77GHz respectively; thus, the center frequency set f= {76.5, 77.0, 77.5, 78.0, 78.5, 79.0, 79.5}, can be constructed.
In addition, when the center frequency point is selected, the antenna gain under the point needs to be ensured to be better, and the influence of the antenna housing is less.
In the technical scheme, the construction of the center frequency set is based on the working frequency band and the performance index, so that the method can flexibly adapt to different radar use environments and requirements, and the requirements of different working frequency bands and signal bandwidths can be met by reasonably setting the number of the center frequency points; the interval between any two center frequency points in the center frequency set is larger than the preset signal bandwidth, so that the frequencies of all waveforms can be ensured not to interfere with each other, the mutual interference between signals is avoided, and the independence and the reliability between the waveforms are ensured; through reasonable selection of the center frequency point, the working frequency band of the current radar can be fully utilized, the frequency coverage range between waveforms is ensured to be reasonable, radar transmitting resources are utilized to the greatest extent, and the efficiency of a transmitting waveform group is improved.
Further, the step S200 further includes:
acquiring a second preset emission period according to the performance index to construct an emission period set according to the second preset emission period; wherein, each emission period is larger than the preset effective emission time.
In this embodiment, Q chirp period parameters are selected according to the radar speed index specification requirement, and a chirp period set t= { T 1、T2、…、T Q }, where T 1、T2、…、T Q＞Tp, and both satisfy the speed index requirement or satisfy the speed index requirement after speed solution blurring, where Q > 1, is constructed.
Assuming that the preset transmission effective time is 30 microseconds, a transmission period set t= {30, 33, 35, 38, 40, 41, 43, 46, 49, 51}; the preset effective transmitting time is selected according to the radar speed index specification requirement.
In the technical scheme, the second preset transmitting period is acquired according to the performance index, so that the requirement of the radar on the transmitting period can be accurately met; each emission period in the emission period set is larger than the preset effective emission time, so that the enough time length of the emission signal is ensured, the problems of signal interception and incompleteness are avoided, the integrity of the emission signal can be ensured, and the reliability and the effectiveness of the radar system are improved.
Further, the step S200 further includes:
And obtaining a frequency modulation slope positive value and a frequency modulation slope negative value according to the performance index, and constructing a frequency modulation slope set according to the frequency modulation slope positive value and the frequency modulation slope negative value.
In this embodiment, the set of chirp parameters u= { μ 1、-μ1 }.
Assuming a positive value of 20MHz/μs for the frequency modulation slope and a negative value of-20 MHz/μs for the frequency modulation slope; thus the set of frequency modulated ramps u= {20, -20}.
In the technical scheme, the positive value and the negative value of the frequency modulation slope are obtained according to the performance index, so that the requirement of the radar on the frequency modulation slope can be accurately met, and the range of the frequency modulation slope and the selection with proper precision and accuracy can be ensured by constructing the frequency modulation slope set; by constructing the frequency modulation slope set, frequency modulation waves with different slopes can be generated, different frequency modulation waves have different frequency change speeds, and frequency change with a larger range and higher speed can be realized, so that different radar detection requirements are met.
S300: and acquiring a frequency modulation wave according to the waveform parameter set and a second preset waveform parameter so as to generate a transmitting waveform group according to the frequency modulation wave.
Further, the step S300 includes:
and acquiring a target central frequency, a target transmitting period and a target frequency modulation slope corresponding to a third preset frequency modulation wave from the central frequency set, the transmitting period set and the frequency modulation slope set, and generating the third preset frequency modulation wave by combining preset transmitting effective time and preset signal bandwidth so as to generate a transmitting waveform group according to the third preset frequency modulation wave.
The transmitting waveform group comprises preset frame transmitting waveforms, and each frame transmitting waveform comprises N identical frequency modulation waves, wherein N is more than 1; further, P, Q and N may be the same or different values, but N must be greater than P and Q.
In addition, at least 2 parameters of the chirp wave period, the frequency modulation slope and the central frequency of the current frame are different from those of the adjacent frame, and other parameters are consistent with those of the adjacent frame. The chirp period, chirp rate, center frequency of each frame are all sequentially or randomly valued from the set F, T, U.
Assuming that the m-th frame transmit waveform N (1N) is equal to or longer than the chirp period T i e T, chirp effective time T p, the frequency modulation slope μ j e U, the signal bandwidth B, the center frequency F k e F, etc., the transmit waveform s (T) can be expressed as:
s(t)＝φ(t)exp(j2πfkt)
Wherein, Representing the baseband signal, the expression is:
The symbol rect (t) is expressed as:
In the technical scheme, the parameters of the frequency modulation wave can be accurately determined by acquiring the target center frequency, the transmitting period and the frequency modulation slope from the center frequency set, the transmitting period set and the frequency modulation slope set, so that the transmitting waveform set can be ensured to meet the preset requirement, and the accuracy of the radar system is improved; when the target frequency modulation wave is generated by combining the preset transmission effective time and the preset signal bandwidth, the frequency range and the change rate of the waveform can be optimized, so that the target frequency modulation wave can be ensured to complete frequency change within the specified effective time, the waveform is prevented from exceeding the range of the preset signal bandwidth, and the detection and resolution capability of the radar system to the target is further improved.
Further, assuming that there are two targets with distances of 80m and 60m, and velocities of 75m/s and 15m/s, respectively, if a conventional transmit waveform is used, the echo data of different frames are subjected to distance-velocity dimension transformation, and the distance Doppler spectrum of the echo is shown in FIG. 2. If the transmission waveform of the present application is adopted, carrier frequency step modulation, modulation frequency modulation slope and modulation pulse repetition period are taken as examples, and the specific example is shown in fig. 3. Where the number of frames k=4, f k =f0+kΔf, f0=77 GHz, Δf=200 MHz, pulse repetition period T K = [38 μs, 53 μs, 58 μs, 83 μs ], frequency modulation slope γ k = [19.737MHz/us, -19.737MHz/us,19.737MHz/us, -19.737MHz/us ]. After the distance velocity dimension transformation is performed on the echo data of different frames, the distance Doppler spectrum of the echo is shown in figure 4. It can be seen from the figure that unlike fig. 2, the target velocity in fig. 4 is located differently in the range-doppler spectrum, and the velocity ambiguity can be subsequently interpreted using the chinese remainder theorem, thereby further expanding the velocity range. In addition, as the parameters of the transmitted waveform are changed, the radar is not easy to continuously interfere with the same frequency, the probability of false target generation caused by interference is reduced, and the anti-interference performance is further improved.
Embodiment two:
referring to fig. 5, the present application further provides an application method of a transmit waveform group, which is applied to the transmit waveform group generating method, and the application method includes the following steps:
a transmit waveform group is acquired in response to the transmit waveform group generation signal.
Radiating the emission waveform group to a preset area to obtain a received signal of the emission waveform group after being reflected by a preset target in the preset area, and performing first preset processing on the received signal to generate a digital signal.
And carrying out second preset processing on the digital signal to obtain the trace information of the preset target.
In the technical scheme, after the emission waveform group is radiated to the preset area, the received reflected signal is subjected to preset processing to generate a digital signal, and the obtained digital signal can reflect the characteristics and information of a preset target more accurately because the emission waveform group has optimized parameters and characteristics; by carrying out second preset processing on the digital signals, the trace information of the preset target can be extracted, so that subsequent data analysis and processing can be conveniently carried out, the target is identified, valuable information is extracted, and a foundation is provided for further target tracking and analysis.
Further, the first preset processing at least comprises local oscillation mixing processing, filtering processing and sampling processing.
In the technical scheme, the received signal can be converted into the baseband frequency through the local oscillation mixing processing, so that the subsequent signal processing and analysis are convenient, the signal frequency can be reduced, the processing complexity is reduced, and the working efficiency of the system is improved; the filtering process can remove unnecessary frequency components and noise, and retain the effective part of the target signal, so that the signal-to-noise ratio can be improved, interference and erroneous judgment can be reduced, and the reliability and accuracy of the target signal can be improved.
Further, in the present embodiment, the samples are ADC samples; wherein the filtered signal is input to an analog-to-digital converter (ADC) for sampling, the ADC converting a continuous-time analog signal into a discrete-time digital signal.
The second preset process at least comprises Fourier transformation, target detection, angle measurement and speed ambiguity resolution.
In this embodiment, the fourier transform includes at least a distance-dimensional FFT and a speed-dimensional FFT.
The radar echo signal is propagated back along with time delay, the distance dimension FFT can convert time domain data into frequency domain data, distance information is extracted from the echo signal, and the distance dimension FFT processing obtains a distance-time two-dimensional image which can accurately find the distance and the distance distribution of the target.
The Doppler frequency shift of the echo signal received by the radar occurs along with the movement of the target, the speed dimension FFT can convert frequency domain data into a speed-frequency two-dimensional image, the speed information of the target detected by the radar can be obtained through the speed dimension FFT processing, and the speed analysis of the high-speed target can be realized.
In addition, the target detection is to identify and detect the target signal based on a signal processing method, and through the signal after the preset processing, various target detection algorithms can be used for automatically identifying and detecting the target, so that the automation degree and the detection precision of the system are improved; the angle measurement is to measure the azimuth or angle of the target by using the received signal, and the azimuth or angle information of the target can be determined by carrying out angle measurement on the signal after the preset treatment, so that the positioning and the orientation of the target are realized; the speed blurring is frequency blurring caused by the movement of the target, and the speed information of the target can be accurately inverted through speed blurring solving processing, so that the measuring precision of the speed of the target is improved.
Embodiment III:
referring to fig. 6, the present application further provides a system for applying a method of transmitting a waveform group, the system comprising:
The acquisition module is used for: for acquiring a transmit waveform group in response to the transmit waveform group generation signal.
And a radiation module: for radiating the set of transmit waveforms to a predetermined area.
And a receiving module: and the receiving signals are used for acquiring the receiving signals of the transmitting waveform group after being reflected by the preset target in the preset area.
A first processing module: and the digital signal processing unit is used for carrying out first preset processing on the received signal to generate a digital signal.
And a second processing module: and the digital signal processing unit is used for carrying out second preset processing on the digital signal so as to acquire the trace information of the preset target.
In the technical scheme, after being radiated to a preset area and subjected to preset treatment, the generated digital signal can accurately reflect the characteristics and information of a preset target due to the optimized parameters and characteristics of the emission waveform group; and the digital signals are subjected to second preset processing, so that the trace information of the preset target can be extracted, a basis is provided for subsequent data analysis and processing, the target can be conveniently identified, valuable information can be extracted, and further tracking and further analysis work of the target are supported.
Embodiment four:
The application also provides a storage medium having stored therein a computer program, wherein the computer program is arranged to execute the method of application of the set of transmit waveforms at run-time.
In this embodiment, the storage medium stores a number of computer programs for causing a radar system to perform all or part of the steps of the methods described in the various embodiments of the application.
The storage medium may include a usb disk, a removable hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc. various media capable of storing program codes.
In summary, the present application provides a method, an application method, a system and a storage medium for generating a transmit waveform group; according to the performance index of the current radar, firstly determining waveform parameters of the frequency modulation wave, wherein the parameters comprise a first preset waveform parameter and a second preset waveform parameter; then, constructing a waveform parameter set corresponding to the first preset waveform parameter according to the performance index; and finally, generating a frequency modulation wave by utilizing the waveform parameter set and the second preset waveform parameter, and generating a transmitting waveform group. The emission waveform group generated by the method is not only suitable for single-shot single-received millimeter wave radar, but also suitable for multi-shot multi-received millimeter wave radar, and can be also suitable for time division multiple access modulation radar and Doppler multiple access modulation radar; the generation method not only can meet the detection performance requirement of the radar, but also can improve the anti-interference capability of the radar; in addition, the generated waveform is simpler, is easy to realize in engineering, and can be well adapted to the existing signal processing method.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely exemplary and are not intended to limit the scope of the present application thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the application. All such changes and modifications are intended to be included within the scope of the present application as set forth in the appended claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the application has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.
Claims (10)
1. A method of generating a transmit waveform group, comprising the steps of:
s100: determining waveform parameters of the frequency-modulated wave according to the performance index of the current radar, wherein the waveform parameters at least comprise a first preset waveform parameter and a second preset waveform parameter;
S200: constructing a waveform parameter set corresponding to a first preset waveform parameter based on the performance index;
S300: and acquiring a frequency modulation wave according to the waveform parameter set and a second preset waveform parameter so as to generate a transmitting waveform group according to the frequency modulation wave.
2. The method of generating a set of transmit waveforms of claim 1, wherein the first preset waveform parameters include at least a center frequency parameter, a transmit period parameter, and a chirp rate parameter;
The second preset waveform parameters at least comprise a transmission effective time parameter and a signal bandwidth parameter;
the waveform parameter set at least comprises a center frequency set, a transmission period set and a frequency modulation slope set.
3. The method of generating a set of transmit waveforms according to claim 2, wherein said step S200 comprises:
acquiring a working frequency band of a current radar, and acquiring a first preset center frequency point according to the working frequency band and performance indexes to construct a center frequency set according to the first preset center frequency point; the interval between any two center frequency points is larger than the preset signal bandwidth.
4. The method of generating a set of transmit waveforms according to claim 3, wherein said step S200 further comprises:
acquiring a second preset emission period according to the performance index to construct an emission period set according to the second preset emission period; wherein, each emission period is larger than the preset effective emission time.
5. The method of generating a set of transmit waveforms as claimed in claim 4, wherein said step S200 further comprises:
And obtaining a frequency modulation slope positive value and a frequency modulation slope negative value according to the performance index, and constructing a frequency modulation slope set according to the frequency modulation slope positive value and the frequency modulation slope negative value.
6. The method of generating a set of transmit waveforms as claimed in claim 5, wherein said step S300 includes:
and acquiring a target central frequency, a target transmitting period and a target frequency modulation slope corresponding to a third preset frequency modulation wave from the central frequency set, the transmitting period set and the frequency modulation slope set, and generating the third preset frequency modulation wave by combining preset transmitting effective time and preset signal bandwidth so as to generate a transmitting waveform group according to the third preset frequency modulation wave.
7. A method of applying a set of transmit waveforms, as applied to the method of generating a set of transmit waveforms of any one of claims 1-6, the method comprising the steps of:
Acquiring a transmission waveform group in response to the transmission waveform group generation signal;
Radiating the emission waveform group to a preset area to obtain a received signal of the emission waveform group after being reflected by a preset target in the preset area, and performing first preset processing on the received signal to generate a digital signal;
And carrying out second preset processing on the digital signal to obtain the trace information of the preset target.
8. The method according to claim 7, wherein the first preset processing includes at least local oscillation mixing processing, filtering processing, and sampling processing;
The second preset process at least comprises Fourier transformation, target detection, angle measurement and speed ambiguity resolution.
9. A system employing the method of application of the set of transmit waveforms of any of claims 7-8, the system comprising:
the acquisition module is used for: for acquiring a transmit waveform group in response to the transmit waveform group generation signal;
And a radiation module: for radiating the set of transmit waveforms to a predetermined area;
And a receiving module: the receiving signals are used for acquiring the receiving signals of the transmitting waveform group after being reflected by a preset target in the preset area;
a first processing module: the digital signal processing module is used for carrying out first preset processing on the received signal to generate a digital signal;
and a second processing module: and the digital signal processing unit is used for carrying out second preset processing on the digital signal so as to acquire the trace information of the preset target.
10. A storage medium having stored therein a computer program, wherein the computer program is arranged to execute the method of application of the set of transmit waveforms of any of claims 7-8 when run.
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